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Tae-Hoon Kim(김태훈),Dong-Woon Heo(허동운),Jong-Hyun Ryu(류종현),Chang-Won Jeong(정창원),Hong Young Jun(전홍영),Kyu Gyeom Kim(김규겸),Jee Min Hong(홍지민),Mi Yeon Jang(장미연),Dae Won Kim(김대원),Kwon-Ha Yoon(윤권하) 한국컴퓨터정보학회 2017 한국컴퓨터정보학회 학술발표논문집 Vol.25 No.1
This study was to develop a portable digital radiography (PDR) system with a function measuring the X-ray source-with-detector angle (SDA) and to evaluate the imaging performance for the diagnosis of chest imaging. The SDA device consisted of an Arduino, an accelerometer and gyro sensor, and a Bluetooth module. According to different angle degrees, five anatomical landmarks on chest images were assessed using a 5-point scale. Mean signal-to-noise ratio and contrast-to-noise ratio were 182.47 and 141.43. Spatial resolution (10% MTF) and entrance surface dose were 3.17 lp/mm (157μm) and 0.266mGy. The angle values of SDA device were not significant difference as compared to those of the digital angle meter. In chest imaging, SNR and CNR values were not significantly different according to different angle degrees (repeated-measures ANOVA, p>0.05). The visibility scores of the border of heart, 5th rib and scapula showed significant differences according to different angles (rmANOVA, p<0.05), whereas the scores of the clavicle and 1st rib were not significant. It is noticeable that the increase in SDA degree was consistent with the increase of visibility score. Our PDR with SDA device would be useful to be applicable to clinical radiography setting according to the standard radiography guideline at various fields.
나노위치제어를 이용한 연 X-선 결상현미경 시스템의 조명광학소자 정렬
김재희(Jea Hee Kim),김규겸(Kyu Gyeom Kim),민종환(Jong Hwan Min),김경우(Kyong Woo Kim),권영만(Young Man Kwon),민진영(Jin Young Min),윤권하(Kwon Ha Yoon) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
This paper presents a method of alignment for condenser mirror of soft x-ray microscopy system based on nano-positioning control. The X-ray source was focused on a sample by a doubled ellipsoidal condenser reflective mirror. X-ray source focusing will increase the photon density in the object plane and is very important to approach high resolution imaging. Required degree of freedom (DOF) of optics aligner in X-ray microscope is dependent on the kind of optics, but generally 5-DOF is needed. We used 5-axis manipulator that consists of three linear motions (X, Y and Z) and two tilting motions (Rx, Ry). A linear translation stage is adopted a kind of DC motor with a linear resolution 50nm and travel range of 5mm. The mechanism was controlled with PID controller augmented with closed feedback loop for precision control. A two axis tilt stage is employed a design resolution of 0.23μrad and tilt range of ±7deg. We have designed 5-axis manipulator for alignment of condenser mirror and developed to control algorithm by inverse kinematics. The performance of the proposed 5-DOF manipulator is evaluated by using a laser interferometer system with two plane mirror reflectors. The experimental results are depicted in this paper.
소형화 연 X-선 투과현미경을 위한 새로운 광학설계와 개발
김경우(Kyong-Woo Kim),권영만(Young-Man Kwon),김규겸(Kyu-Gyeom Kim),김재희,민종환(Jong-Hwan Min),임종혁(Jong-Hyeok Lim),남기용(Ki-Yong Nam),민진영(Jin-Young Min),윤권하(Kwon-Ha Yoon) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In this paper the conceptual design and development of a compact vertical type soft x-ray microscope is described. This x-ray microscope operates in the water window wavelength region (2.3~4.4㎚), where natural contrast between carbon (protein) and oxygen (water) allows imaging of unstained biological material their natural, hydrated environment. Until now, operational x-ray microscopes are based on synchrotron radiation sources, which limit their accessibility. Many biologists would benefit from having the x-ray microscope as a tool among other tools in their own laboratory. For this purpose we introduced the compact vertical type soft X-ray microscope with 50 ㎚ resolution for biomedical application. The compact vertical type soft x-ray microscope is based on a laser plasma x-ray source, doubled ellipsoidal condenser reflective optics, diffractive zone plate optics and MCP coupled with CCD to record an x-ray image. The source is a liquid-jet target laser plasma source, which is practically debris free and suitable for high average power operation. The flux, brightness and bandwidth of this source has been simulated and optimized for X-ray microscopy for biology application. A doubled ellipsoidal condenser reflective mirror operates as condenser and illuminates the sample. The high resolution imaging is currently performed with a ~12% efficient Au zone plate with an outmost zone width of 36㎚. Detection is performed with a Chevron typed MCP coupled with CCD.
뇌척추질환 전용 수술중 CT 광학융합 시스템에 관한 연구
정창원 ( Chang Won Jeong ),김지언 ( Ji-eon Kim ),김규겸 ( Kyu Gyeom Kim ),김태훈 ( Tae-hoon Kim ),유종현 ( Jong-hyun Ryu ),전홍영 ( Hong Young Jun ),홍지민 ( Jee Min Hong ),김대원 ( Dae Won Kim ),윤권하 ( Kwon-ha Yoon ) 한국정보처리학회 2017 한국정보처리학회 학술대회논문집 Vol.24 No.1
최근 의료영상진단기기 개발 동향은 ICT 기술과 접목하는 융합진단 영상기기 개발연구로 활발하게 진행되고 있다. 특히, 수술중 CT의 개발은 임상적 미수요 충족을 위한 최첨단 기술개발로 위급한 환자를 의료영상 촬영을 위한 지정장소로 이동해야하는 문제점을 해결하여 현장 어느 곳에서 촬영할 수 있고, 환자의 다양한 의료영상을 융합하여 환자의 병변에 대한 명확한 위치와 형태 그리고 상태를 파악할 수 있도록 하며 수술을 위한 네비게이션 기능을 포함한다. 본 논문에서는 수술중 CT에 대한 설계한 사항에 대해 기술하고자 한다. 제안한 시스템의 개발은 다양한 임상현장에서 신속하게 진단과 수술을 지원할 수 있을 것으로 기대하고 있다.
신경망 외란관측기와 파라미터 보상기를 이용한 PMSM의 속도제어
고종선(Jong-Sun Ko),이용재(Yong-Jae Lee),김규겸(Kyu-Gyeom Kim) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
This paper presents neural load disturbance observer that used to deadbeat load torque observer and regulation of the compensation gain by parameter estimator. As a result, the response of PMSM follows that of the nominal plant. The load torque compensation method is compose of a neural deadbeat observer. To reduce of the noise effect, the post-filter, which is implemented by MA process, is proposed. The parameter compensator with RLSM (recursive least square method) parameter estimator is suggested to increase the performance of the load torque observer and main controller. The proposed estimator is combined with a high performance neural torque observer to resolve the problems As a result, the proposed control system becomes a robust and precise system against the load torque and the parameter variation A stability and usefulness, through the verified computer simulation, are shown in this paper.